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Submitted on: 27 June 2001.
Revised on: 12 October 2001.
Accepted on: 28 October 2001.
___________________JOURNAL OF NAVIGATION---CAMBRIDGE UNIV PRESS
Submitted on: 13 September 2015.
Revised on: 28 December 2015.
Accepted on: 30 January 2016.
___________________JOURNAL OF NAVIGATION---CAMBRIDGE UNIV PRESS
Submitted on: 27 October 2011.
Revised on: 17 December 2011.
Accepted on: 14 February 2012.
___________________JOURNAL OF NAVIGATION---CAMBRIDGE UNIV PRESS
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Submitted on: 20 March 2008.
Revised on: 10 July 2008.
Accepted on: 29 July 2008.
___________________JOURNAL OF NAVIGATION---CAMBRIDGE UNIV PRESS
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Submitted on: 27 April 2005.
Revised on: 31 July 2005.
Accepted on: 13 August 2005.
___________________JOURNAL OF NAVIGATION---CAMBRIDGE UNIV PRESS
Submitted on: 16 November 2009.
Revised on: 03 January 2010.
Accepted on: 28 February 2010.
___________________JOURNAL OF NAVIGATION---CAMBRIDGE UNIV PRESS
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